The captcha works well but here it comes the problem: it f*cks up cookies.
After any user goes to registration page (index of your account module), and sees the captcha, he is not able to read anymore the comments of the newspost (or other activities) because when he clicks on "comments" the website is refreshed.

You will need to add the session_start in the mainfile.php before any other header output. Then you can safely use $_SESSION variable. Also make sure that when setting the $_SESSION variable you do it before any header output.

_________________The path of the righteous man is beset on all sides by the inequities of the selfish and the tyranny of evil men. Blessed is he, who in the name of charity and good will, shepherds the weak through the valley of darkness, for he is truly his brother's keeper and the finder of lost children. And I will strike down upon thee with great vengeance and furious anger those who would attempt to poison and destroy my brothers. And you will know my name is the Lord when I lay my vengeance upon thee. Ezekiel 25:17

Thanks mate, last thing.
We are having randomly this "Invalid Session. Please resubmit the form." in forum. Ive searched that in google and i found some "solutions" and it was about cookie configuration in forum, but since i fixed it following those instructions, it still appearing to some users.

Could it be cause the other cookie problem that im having with session start?

It could be if your trying to set the session in the mainfile also. Look for that error in posting.php and see what they are checking.

Is this the new PHP Nuke version that was just released? I would bet it is full of bugs.

_________________The path of the righteous man is beset on all sides by the inequities of the selfish and the tyranny of evil men. Blessed is he, who in the name of charity and good will, shepherds the weak through the valley of darkness, for he is truly his brother's keeper and the finder of lost children. And I will strike down upon thee with great vengeance and furious anger those who would attempt to poison and destroy my brothers. And you will know my name is the Lord when I lay my vengeance upon thee. Ezekiel 25:17

It started 1 month ago, i dont know why but now it only affects to some normal users.
How i tested it? i used teamviewer with a friend and i tried to post a reply in a forum thread. "Invalid Session. Please resubmit the form." with his acc. Then i logged off, logged in with mine (admin) and no problem.

I found in internet so many threads about this but any of them gave me the solution. Here it is my cookie configuration at forum:
Cookie domain http://rocarena.com/np
Cookie name phpbbrocarena
Cookie path /np/
Cookie secure Disabled
Session length [ seconds ] 3600

_________________The path of the righteous man is beset on all sides by the inequities of the selfish and the tyranny of evil men. Blessed is he, who in the name of charity and good will, shepherds the weak through the valley of darkness, for he is truly his brother's keeper and the finder of lost children. And I will strike down upon thee with great vengeance and furious anger those who would attempt to poison and destroy my brothers. And you will know my name is the Lord when I lay my vengeance upon thee. Ezekiel 25:17

I don't think the session check is even needed since the sessions aren't even used.

_________________The path of the righteous man is beset on all sides by the inequities of the selfish and the tyranny of evil men. Blessed is he, who in the name of charity and good will, shepherds the weak through the valley of darkness, for he is truly his brother's keeper and the finder of lost children. And I will strike down upon thee with great vengeance and furious anger those who would attempt to poison and destroy my brothers. And you will know my name is the Lord when I lay my vengeance upon thee. Ezekiel 25:17

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